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The pilot reported that the helicopter was cruising at 2000 feet when, without warning, there was a complete loss of engine power. During the subsequent forced landing, the tail boom struck the ground, causing the tail rotor gear box to separate from the aircraft. Investigation revealed that the engine accessory gear train had failed, causing both magnetos to cease operation. The gear train failed due to lack of torque followed by the fatigue failure of six screws that attach the accessory drive gear to the starter gear. The cause of the loss of torque was not established.

Download Final Report
[ Download PDF: 22KB]
General details
Date: 23 May 1987 Investigation status: Completed 
Time: 1440  
Location:14 km SE Gympie Investigation type: Occurrence Investigation 
State: Queensland  
Release date: 08 November 1988  
Report status: Final Occurrence category: Accident 
 Highest injury level: None 
Aircraft details
Aircraft manufacturer: Hiller Aviation 
Aircraft model: UH-12 
Aircraft registration: VH-FFX 
Serial number: 5066 
Type of operation: Business 
Damage to aircraft: Substantial 
Departure point:Caloundra QLD
Departure time:1420
Destination:Rockhampton QLD
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